United Air Lines. Group of 3 posters. 1960s. Color silkscreen travel posters depicting various cities. Group includes: Detroit, showing an auto assembly line with engines held with claws. ? Denver, depicting a saddle floating in front of two skyscrapers . ? Pittsburgh, depicting a steel mill factory scene with molten ore. All done in a lively and colorful block print style. Each 40 ? x 26 ? ?(each). Restoration at upper corners and some creasing and wrinkling at edges. Condition generally A-/B+.